According to my July 1969 issue of the 1967-1969 Camaro Master Parts catalog, the heat riser valve is the same part number for the 1967 thru 1969, 302ci, 327ci, and 350 ci engines and that part number is #3887023. I have my original 1968 Z28 heat riser valve in my hand and it looks identical to the NOS one shown above. I would take a picture of mine but being it looks identical, I see no reason for another picture.

BTW.....the 1969 AIM shows in the exact position as John Z's.

I saw that in the AIM, and wonder if they were all assembled like that. I have found a couple pics of so called" original cars " where they were installed vertical or parallel to the frame rail.As I said mine could have been turned by accident(?) when the new exhaust was installed, just seemed unlikely. (here is a pic of a so called original)

According to my July 1969 issue of the 1967-1969 Camaro Master Parts catalog, the heat riser valve is the same part number for the 1967 thru 1969, 302ci, 327ci, and 350 ci engines and that part number is #3887023. I have my original 1968 Z28 heat riser valve in my hand and it looks identical to the NOS one shown above. I would take a picture of mine but being it looks identical, I see no reason for another picture.

BTW.....the 1969 AIM shows in the exact position as John Z's.

I saw that in the AIM, and wonder if they were all assembled like that. I have found a couple pics of so called" original cars " where they were installed vertical or parallel to the frame rail.As I said mine could have been turned by accident(?) when the new exhaust was installed, just seemed unlikely. (here is a pic of a so called original)

Found #3887034 is for BB and 3887023 is for SB. GM still carries them and I have seen them on line going from $50.00 to $150.00 at the GM parts houses. Reproductions are way cheaper though but who knows about quality.

the spring retainer pin is pointing at the frame rail, and the counter weight is parallel to the frame. (Valve is in the same position as the first pic I put up, just different angle --> HEAD ON perspective instead of from the SIDE)

So I am not convinced there was only one way they were installed on the line, (yet)...

the spring retainer pin is pointing at the frame rail, and the counter weight is parallel to the frame. (Valve is in the same position as the first pic I put up, just different angle --> HEAD ON perspective instead of from the SIDE)

So I am not convinced there was only one way they were installed on the line, (yet)...

So the lever is probably pointing to the firewall and not the radiator, at least it looks like that from the pic.

According to my July 1969 issue of the 1967-1969 Camaro Master Parts catalog, the heat riser valve is the same part number for the 1967 thru 1969, 302ci, 327ci, and 350 ci engines and that part number is #3887023. I have my original 1968 Z28 heat riser valve in my hand and it looks identical to the NOS one shown above. I would take a picture of mine but being it looks identical, I see no reason for another picture.

BTW.....the 1969 AIM shows in the exact position as John Z's.

I saw that in the AIM, and wonder if they were all assembled like that. I have found a couple pics of so called" original cars " where they were installed vertical or parallel to the frame rail.As I said mine could have been turned by accident(?) when the new exhaust was installed, just seemed unlikely. (here is a pic of a so called original)

According to my July 1969 issue of the 1967-1969 Camaro Master Parts catalog, the heat riser valve is the same part number for the 1967 thru 1969, 302ci, 327ci, and 350 ci engines and that part number is #3887023. I have my original 1968 Z28 heat riser valve in my hand and it looks identical to the NOS one shown above. I would take a picture of mine but being it looks identical, I see no reason for another picture.

BTW.....the 1969 AIM shows in the exact position as John Z's.

I saw that in the AIM, and wonder if they were all assembled like that. I have found a couple pics of so called" original cars " where they were installed vertical or parallel to the frame rail.As I said mine could have been turned by accident(?) when the new exhaust was installed, just seemed unlikely. (here is a pic of a so called original)

I have an original 69 Z28 w/original exh. manifolds and still has the old original smog equip, mine is installed like this.

Well thats what is debatable, JohnZ car it is pointed towards firewall, and it also shows that in the AIM. I have seen original cars with it both ways (weight pointed to the firewall, or pointed to the frame rail). It made me wonder if they switched the way they mounted them, Maybe later 69 cars have it pointed towards the firewall? or who was working that shift on the line when installing? Just a wild guess on my part.

Someone referenced the AIM.. I've searched thru it, looking for a view of the heat riser,and could not find one. What section/page is this located in?

and to respond to another comment: Yes, Z28's have/had headers (or 99% did) within a few days of delivery, as that was the intention of the engineer who conceived/designed the 302... .. it's only now that we are all striving to 'restore' to factory configuration..